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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 680 · 40 questions
TalentJR

The trick (Count the places): Forget the points and multiply the whole numbers. Count all the digits after the points in the question. Put the point that many places from the right, then check by rounding.

NameDateTime takenScore ___ / 40
  1. 1.1.3 × 33 — where does the decimal point go? (a) 429 (b) 42.9 (c) 0.429 (d) 4.29
  2. 2.7.7 × 0.2 — where does the decimal point go? (a) 0.0154 (b) 1.54 (c) 0.154 (d) 15.4
  3. 3.0.97 × 0.6 — where does the decimal point go? (a) 0.0582 (b) 0.00582 (c) 0.582 (d) 5.82
  4. 4.0.96 × 0.4 — where does the decimal point go? (a) 0.00384 (b) 0.0384 (c) 3.84 (d) 0.384
  5. 5.8.7 × 9 — where does the decimal point go? (a) 78.3 (b) 7.83 (c) 0.783 (d) 783
  6. 6.0.74 × 29 — where does the decimal point go? (a) 2.146 (b) 21.46 (c) 214.6 (d) 0.2146
  7. 7.4.7 × 8 — where does the decimal point go? (a) 37.6 (b) 3.76 (c) 376 (d) 0.376
  8. 8.2.1 × 38 — where does the decimal point go? (a) 798 (b) 0.798 (c) 7.98 (d) 79.8
  9. 9.0.92 × 0.7 — where does the decimal point go? (a) 0.0644 (b) 0.00644 (c) 6.44 (d) 0.644
  10. 10.4.4 × 0.9 — where does the decimal point go? (a) 39.6 (b) 0.0396 (c) 0.396 (d) 3.96
  11. 11.0.58 × 3 — where does the decimal point go? (a) 1.74 (b) 17.4 (c) 0.174 (d) 0.0174
  12. 12.0.87 × 4 — where does the decimal point go? (a) 0.348 (b) 34.8 (c) 0.0348 (d) 3.48
  13. 13.0.59 × 9 — where does the decimal point go? (a) 0.531 (b) 53.1 (c) 5.31 (d) 0.0531
  14. 14.4.6 × 8 — where does the decimal point go? (a) 0.368 (b) 3.68 (c) 36.8 (d) 368
  15. 15.0.79 × 41 — where does the decimal point go? (a) 3.239 (b) 32.39 (c) 323.9 (d) 0.3239
  16. 16.0.76 × 1.3 — where does the decimal point go? (a) 0.988 (b) 0.00988 (c) 9.88 (d) 0.0988
  17. 17.0.78 × 6 — where does the decimal point go? (a) 0.0468 (b) 46.8 (c) 0.468 (d) 4.68
  18. 18.0.39 × 0.7 — where does the decimal point go? (a) 2.73 (b) 0.273 (c) 0.0273 (d) 0.00273
  19. 19.6.8 × 0.7 — where does the decimal point go? (a) 47.6 (b) 4.76 (c) 0.476 (d) 0.0476
  20. 20.0.97 × 2.4 — where does the decimal point go? (a) 2.328 (b) 23.28 (c) 0.2328 (d) 0.02328
  21. 21.0.33 × 0.9 — where does the decimal point go? (a) 2.97 (b) 0.00297 (c) 0.0297 (d) 0.297
  22. 22.0.59 × 36 — where does the decimal point go? (a) 0.2124 (b) 21.24 (c) 2.124 (d) 212.4
  23. 23.9.8 × 0.8 — where does the decimal point go? (a) 7.84 (b) 0.784 (c) 0.0784 (d) 78.4
  24. 24.6.4 × 4.9 — where does the decimal point go? (a) 3.136 (b) 313.6 (c) 31.36 (d) 0.3136
  25. 25.0.51 × 11 — where does the decimal point go? (a) 5.61 (b) 56.1 (c) 0.561 (d) 0.0561
  26. 26.7.5 × 7 — where does the decimal point go? (a) 52.5 (b) 0.525 (c) 525 (d) 5.25
  27. 27.5.7 × 0.9 — where does the decimal point go? (a) 5.13 (b) 51.3 (c) 0.0513 (d) 0.513
  28. 28.0.63 × 6 — where does the decimal point go? (a) 37.8 (b) 0.378 (c) 3.78 (d) 0.0378
  29. 29.6.6 × 2.6 — where does the decimal point go? (a) 1.716 (b) 17.16 (c) 171.6 (d) 0.1716
  30. 30.8.6 × 1.6 — where does the decimal point go? (a) 1.376 (b) 0.1376 (c) 13.76 (d) 137.6
  31. 31.7.1 × 0.2 — where does the decimal point go? (a) 0.142 (b) 1.42 (c) 14.2 (d) 0.0142
  32. 32.9.2 × 1.6 — where does the decimal point go? (a) 14.72 (b) 0.1472 (c) 147.2 (d) 1.472
  33. 33.0.81 × 0.6 — where does the decimal point go? (a) 4.86 (b) 0.0486 (c) 0.486 (d) 0.00486
  34. 34.9.8 × 26 — where does the decimal point go? (a) 2.548 (b) 254.8 (c) 2548 (d) 25.48
  35. 35.3.3 × 4.8 — where does the decimal point go? (a) 158.4 (b) 1.584 (c) 0.1584 (d) 15.84
  36. 36.4.2 × 1.1 — where does the decimal point go? (a) 0.462 (b) 4.62 (c) 46.2 (d) 0.0462
  37. 37.0.36 × 0.9 — where does the decimal point go? (a) 0.00324 (b) 3.24 (c) 0.0324 (d) 0.324
  38. 38.0.48 × 6 — where does the decimal point go? (a) 2.88 (b) 28.8 (c) 0.0288 (d) 0.288
  39. 39.5.6 × 16 — where does the decimal point go? (a) 896 (b) 89.6 (c) 8.96 (d) 0.896
  40. 40.4.8 × 2.1 — where does the decimal point go? (a) 1.008 (b) 10.08 (c) 0.1008 (d) 100.8

Answer key

  1. 42.9
  2. 1.54
  3. 0.582
  4. 0.384
  5. 78.3
  6. 21.46
  7. 37.6
  8. 79.8
  9. 0.644
  10. 3.96
  11. 1.74
  12. 3.48
  13. 5.31
  14. 36.8
  15. 32.39
  16. 0.988
  17. 4.68
  18. 0.273
  19. 4.76
  20. 2.328
  21. 0.297
  22. 21.24
  23. 7.84
  24. 31.36
  25. 5.61
  26. 52.5
  27. 5.13
  28. 3.78
  29. 17.16
  30. 13.76
  31. 1.42
  32. 14.72
  33. 0.486
  34. 254.8
  35. 15.84
  36. 4.62
  37. 0.324
  38. 2.88
  39. 89.6
  40. 10.08

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